[process32] Use one single expression for initializing struct regs
[process32] Use one single expression for initializing struct regs

The purpose of this change is to offer to the compiler the best chances to
optimize the initialization of the struct regs in kthread_create() and in
setup_usermode_task() by using a single expression.

vvaltchev/experimentOs,vvaltchev/experimentOs,vvaltchev/experimentOs,vvaltchev/experimentOs